Belmonte Professional Bass Clarinet Mouthpiece Cap - Nickel Plated for Protection & Durability - Perfect for School Bands, Orchestras & Professional Performances

It dresses up the mouthpiece nice on my bass clarinet when not playing, the ligature fits right over the top. I did need to file down the edges around the cutout though as there was still a roughness there from the cut that had scratched the underside of my mouthpiece, but no problem.